I have calibrated Ag/AgCl reference electrode by linear sweep voltammetry (LSV) test using three electrode system, now I am looking to calibrate it using Cyclic voltammetry (CV) test. How to do that?
Hi Deepak, the potential shift between these two reference electrodes is E°(Ag/AgCl/Cl-) -0.059log[Cl-]+0.059 pH. Experimentally speaking, the best would be to measure the potential difference between a platinum WE and your Ag/AgCl reference electrode in a H2-saturated electrolyte of your choice. Cheers.
I don't understand the method that you are trying to use to calibrate your Ag/AgCl reference electrode (or the answer provided by Dr. Maillard). Nowhere do I see a description of the RHE (normal or standard?) Setting up a RHE is not a trivial undertaking. I can see how you would try to calibrate the reference electrode using LSV or CV and a redox couple of known potential, but I don't understand how the ref. electrode is being used. Is it connected to the solution by a salt bridge or placed directly into the solution. In the latter case, the composition of the solution is critical so as to avoid perturbing the ref. electrode potential. I'm sorry, but there are just too many clarifications needed of your experimental setup to provide a knowledgable answer.
Richard A Durst I have placed the reference electrode directly into the solution of 0.5 M H2SO4 using three electrode system where Pt wire or tip was used as a working electrode, Pt mesh as counter electrode and Ag/AgCl as reference electrode. Then, I performed the CV measurement in the potential window of 0 V to -1.0 V. I hope this much information is sufficient to provide a knowledgeable answer.
In order to determine the potential of the reference electrode, one would normally use a redox couple in the solution that has a known formal potential and obtain the reference electrode potential from that measurement. But since you do not have a redox couple in your solution, I don't see how you can calculate the reference electrode potential from your experiment. Also your very high concentration of sulfuric acid doesn't allow you much of a potential window in the negative potential range. Again, I am sorry but I am having trouble understanding your methodology for calibrating the electrode.
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